Here is the full list of all 15 Planet Protector VR achievements.
Protect the planet for 30 minutes.
Destroy 50 aliens.
Shoot 1000 missiles.
Damage invaders with long-distance shots 250 times.
Clean out the survivors, traffic, and other things clogging up your city streets.
Wipe out 100 Basic UFOs.
Wipe out 100 Glasser UFOs.
Wipe out 100 Stealer UFOs.
Wipe out 100 Brute UFOs.
Wipe out 100 Hive UFOs.
Wipe out 100 Megabeam UFOs.
Complete a round of gameplay with only school buses left in a city.
Destroy all survivors before the aliens can do it!
Overheat both turrets while at least one Megabeam UFO is firing its laser.
Destroy 500 aliens.